Synthesis and characterization of homo- and heterometallic metal-organic frameworks based on 1,2,4,5-benzenetetracarboxylate ligand

Two new three-dimensional metal-organic frameworks, [H2N(CH3)(2)](2)[Zn(btec)]center dot DMF (1, H(4)btec = 1,2,4,5-benzenetetracarboxylate acid) and [H2N(CH3)(2)][ZnLi(btec)]center dot DMF (2), have been solvothermally synthesized and structurally characterized by single crystal X-ray diffraction. Compound 1 based on mu(4)-btec features an anionic homometallic framework with 4-connected pts topology. Compound 2 is a heterometallic organic framework with rare (4, 4, 8)-connected network topology, which can be considered as constitute of a Li-btec (pts) net and a Zn-btec net. Moreover, the luminescent properties of two compounds are investigated in the solid state at room temperature. (C) 2013 Elsevier B.V. All rights reserved.